DS3904U-020+

Digital Potentiometers Overview

The DS3904U-020+ is a triple nonvolatile digital variable resistor IC manufactured by Analog Devices Inc./Maxim Integrated. It integrates three linear digital resistors with end-to-end resistance values of 20kΩ each, providing 128 user-selectable tap positions plus a high-impedance setting for switch operation. The device operates within a supply voltage range of 2.7V to 5.5V and communicates via a 2-wire serial interface (I²C compatible). Resistor settings are stored in nonvolatile memory, ensuring retention during power loss. The component features low temperature coefficients and is housed in an 8-pin µSOP package.

Digital Potentiometers Feature Summary

• Triple 20kΩ Linear Digital Resistors: Contains three independent variable resistors, each offering 128 discrete positions.
• Nonvolatile Memory Storage: Retains programmed resistance settings without continuous power supply.
• Digital Switch Capability: High-impedance mode allows the resistors to function as digital switches when controlled via the serial interface.
• 2-Wire Serial Interface: Utilizes SDA and SCL pins for communication, supporting standard and fast modes up to 400kHz.

Digital Potentiometers Applications

• Power-Supply Calibration
• Fibre Optic Transceiver Modules
• Portable Electronics
• Test Equipment

Digital Potentiometers Procurement Notes

Verify the specific suffix 'U-020+' against the manufacturer's current datasheet revision to confirm pinout compatibility and electrical tolerances. Confirm that the 8-pin µSOP package matches the target PCB footprint requirements. Ensure the design supports the required 2.7V to 5.5V operating voltage range and includes appropriate decoupling capacitors near the VCC pin.

Digital Potentiometers Selection Notes

Select this component when a compact replacement for mechanical trimming potentiometers is required in space-constrained designs. The DS3904U-020+ is suitable for applications needing three independent adjustable resistors controlled digitally. Consider the 20kΩ nominal resistance and 128-position resolution against the circuit's precision requirements. Verify that the system can accommodate the 2-wire serial protocol timing constraints.

Digital Potentiometers Part Context

The DS3904U-020+ belongs to the DS3904/DS3905 family of triple nonvolatile digital variable resistors. While the DS3905 variant utilizes a 10-pin µSOP package and offers additional address pins for bus expansion, the DS3904 uses an 8-pin µSOP package with a single address pin (A0), allowing two devices to share the same serial bus. This part specifically denotes the 20kΩ resistor configuration.

Digital Potentiometers Replacement Considerations

Direct functional replacements within the same family include the DS3904U-010+, which features a mixed resistance configuration of 20kΩ, 10kΩ, and 20kΩ. Designers must verify pin compatibility between the 8-pin µSOP packages before substitution.